Hammerstone

Definition and stakes

Agnes Bierman,  The Topanga Culture: Final Report on Excavations…

“ If we assume a rough piece of source material was purposely flaked down to produce a core to be used solely as a hammerstone, the artifact by definition becomes a flaked tool. However, at this point it bears no resemblance to a hammerstone, but looks more like a chopper or just a plain core and frequently may be classed as such. Once this core is used as a percussion instrument and has its sharp margins battered back, it begins to take on the characteristics of a hammerstone or a used core tool. ”
Source: Gutenberg

Agnes Bierman,  The Topanga Culture: Final Report on Excavations…

“ If battering continues, the final result is an angular nodule whose irregular, worn margins mark the former presence of sharp bifacial flake edges. A well-worn core hammerstone is also a worn-out specimen, at least in the light of its original function.
Of the 1,478 specimens from the Tank Site it is our opinion that their resultant form is derived through means of their own function—that of pecking. That such an implement was much in demand is evidenced by the pecked surfaces of numerous grinding tools.
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Source: Gutenberg

H. T. Irwin,  Excavations at the LoDaisKa Site in the Denver… (1959)

“ Forty-one implements are classified as choppers or hammerstones. Seventy percent of these are of rock quartz, 20 percent of a metamorphic rock, usually schist, and 10 percent of a grainy quartzite. Due to the nature of the material it is extremely difficult to determine whether such artifacts were used primarily as hammerstones or choppers. There are no small round heavily battered specimens which could be considered as hammerstones only. The pieces usually exhibit one sharp edge and one or more blunt battered edges. ”
Source: Gutenberg

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